Using the code found in this thread, I managed to get the LiveGrid to work on Ext JS 3.3.1. It appears to work well as a replacement for the standard grid, but operating multiple grids in parallel from a single LiveGrid store requires additional event handling. Is there any source available which enables operating multiple LiveGrids from the same store in parallel?

Debugging says that, while 'this' points to Ext.ux.grid.livegrid.Toolbar, this.loading (which is refresh button actually) was still not created. It is created in onRender of Ext.ux.grid.livegrid.Toolbar (livegrid-all-debug.js, line 3382) , but this code is not called.
So, the listener is called without rendering the Ext.ux.grid.livegrid.Toolbar.

Most likely, the problem is that bbar of LiveGrid is now Ext.Panel with an array of toolbars instead of the only Ext.ux.grid.livegrid.Toolbar object. Probably, render is called for this array and not for Ext.ux.grid.livegrid.Toolbar.
I'd suppose this this to be fixed so that Ext.ux.grid.livegrid.Toolbar would be looked through all items of bbar property, if it is a panel with an array of toolbars.

0.5.1RC1 and 0.4.2RC1 released

0.5.1RC1 and 0.4.2RC1 released

Those release candidates introduce minor bugfixes and the CheckboxSelectionModel for both ExtJS 3.3 and ExtJS 3.1+. More release notes on the first page of this thread. As usual, you can download the files here http://www.ext-livegrid.com/download/